1.若x-2y+3=0.则6-2x+4y=?
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若5x+3y=3x+4y=x+2y+6,则x+y=___
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
1.若x-2y+3=0.则6-2x+4y=?
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
1.(X-Y)/13=Y/7问(x+y)/y=?.2.x/6=y/4=z/3(x.z.y不为0)则(X+3Y)/3Y-2Z=?
若2x=3y,则(x*x+y*y)/x*x=?
3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
若x^2-y^2=6 x+y=3 则x-y=多少
若x/y=4/3 则3x+2y/2x-5y=
若2x+2y=6x-3y,则x比y=